Thanks for the context/past experiences.

I'm keeping all receipts. The cheap replacement suit was around 520 PLN, roughly 110€. I think that's fairly reasonable.

Tomorrow I'm going to buy some underwear, socks and t-shirts because handwashing in the sink is getting old quite fast.

Today was Day 3, so I was able to fill out a more detailed report via WorldTracer. Hoping to be reunited with my bag soon.